The average major salary at Jackson County was $71,652 , which is 23 percent lower than the average salary for this job in Missouri, and 48 percent lower than the national average for this job . Major salaries at Jackson County typically range from $20,492 to $122,811 (25th to 75th percentile). The highest reported major salary was $122,810. There are 2 employees at Jackson County with the job title major.